YEAR(S) | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ANN | |||||||||||||
1939 | ----- | z | 61.79 | 74.97 | 82.57 | 90.52 | 97.40 | 95.03 | 93.32 | 89.93 | 78.45 | 63.57 | 62.52 | 80.91 | a | |||||||||||
1940 | 54.23 | 63.24 | 72.87 | 77.73 | 87.65 | 91.43 | 95.39 | 92.16 | 89.80 | 79.94 | 63.23 | 62.26 | 77.49 | |||||||||||||
1941 | 56.94 | 63.75 | 66.03 | 73.90 | 86.90 | 91.23 | 92.29 | 91.10 | 84.87 | 77.00 | 66.17 | 59.77 | 75.83 | |||||||||||||
1942 | 59.84 | 61.07 | 67.65 | 77.23 | 87.90 | 96.43 | 95.58 | 89.58 | 85.63 | 76.71 | 72.17 | 61.77 | 77.63 | |||||||||||||
1943 | 57.84 | 68.63 | a | 73.33 | a | 83.97 | 88.60 | a | 94.07 | 94.03 | 97.13 | 86.40 | 77.97 | 68.39 | b | 56.06 | 78.87 | |||||||||
1944 | 55.61 | 62.79 | 68.29 | 76.83 | 85.74 | 94.00 | 95.84 | 92.45 | 85.33 | 79.77 | 63.87 | 58.42 | 76.58 | |||||||||||||
1945 | 59.39 | 66.86 | 70.80 | a | 77.13 | 87.68 | 93.13 | 93.97 | 94.52 | 89.97 | 76.58 | 70.33 | ----- | z | 80.03 | a | ||||||||||
1946 | 57.57 | q | 66.11 | 72.94 | 83.10 | 86.00 | 97.40 | 94.87 | 94.48 | 89.07 | ----- | z | 66.34 | a | 61.61 | 81.19 | b | |||||||||
1947 | 54.70 | a | 66.32 | 71.65 | 79.23 | 89.77 | 95.37 | 97.48 | 91.74 | 90.57 | 85.29 | g | 64.20 | 55.00 | 77.82 | a | ||||||||||
1948 | 59.00 | b | 63.17 | 67.48 | 83.97 | 90.35 | 96.27 | 97.42 | 95.19 | 89.67 | 76.90 | 66.13 | 61.45 | 78.92 | ||||||||||||
1949 | 47.20 | a | 61.61 | 73.81 | 77.93 | 88.84 | 96.20 | 95.26 | 94.00 | 88.10 | 76.94 | 73.63 | 57.53 | a | 77.59 | |||||||||||
1950 | 62.97 | 68.79 | 73.81 | 82.43 | 87.42 | 98.10 | 92.45 | 94.61 | 87.03 | 87.55 | 72.83 | 66.13 | 81.18 | |||||||||||||
1951 | 60.87 | 62.93 | 70.60 | a | 77.23 | 88.48 | 97.10 | 99.58 | 95.94 | 92.83 | 82.48 | 66.50 | 59.90 | 79.54 | ||||||||||||
1952 | 66.35 | 62.93 | 66.94 | 77.80 | 88.23 | 96.87 | 95.16 | 96.94 | 90.67 | 83.94 | 64.57 | 60.45 | 79.24 | |||||||||||||
1953 | 66.10 | 63.71 | 73.74 | 78.53 | 84.84 | 99.53 | 95.39 | 95.77 | 92.30 | 80.83 | a | 69.53 | 53.29 | 79.46 | ||||||||||||
1954 | 64.26 | 69.61 | 70.74 | 85.17 | 89.32 | 93.89 | c | 98.00 | 92.35 | 92.37 | 82.26 | 71.40 | 62.19 | 80.96 | ||||||||||||
1955 | 55.43 | a | 61.65 | b | 73.31 | b | 80.00 | 86.00 | 95.07 | a | 93.00 | 94.13 | 91.83 | 81.55 | 70.17 | 64.58 | 78.89 | |||||||||
1956 | 63.84 | 61.82 | a | 73.97 | 76.80 | 92.65 | 100.00 | 96.97 | 93.74 | 93.87 | 84.74 | 65.30 | 58.81 | 80.21 | ||||||||||||
1957 | 62.61 | 71.50 | 70.61 | 77.63 | 84.16 | 96.73 | 99.32 | 94.13 | 88.93 | 74.61 | 62.13 | 61.16 | 78.63 | |||||||||||||
1958 | 55.23 | 65.68 | 62.45 | 77.97 | 88.97 | 98.57 | 98.52 | 96.48 | 86.77 | 74.06 | 67.43 | 63.39 | 77.96 | |||||||||||||
1959 | 63.10 | 63.50 | 69.87 | 79.63 | 88.74 | 97.40 | 95.74 | 93.94 | 91.93 | 81.58 | 64.60 | 59.58 | 79.13 | |||||||||||||
1960 | 54.68 | 59.31 | 74.73 | a | 81.30 | 87.16 | 99.50 | 93.55 | 95.03 | 90.63 | 79.90 | 70.17 | 52.16 | 78.18 | ||||||||||||
1961 | 55.06 | 64.25 | 71.48 | 79.90 | 90.16 | 96.53 | 96.90 | 93.10 | 87.13 | 80.84 | 59.60 | 60.68 | 77.97 | |||||||||||||
1962 | 54.65 | 68.93 | 65.39 | 82.63 | 89.26 | 95.47 | 93.06 | 96.97 | 85.87 | 80.13 | 70.47 | 59.06 | 78.49 | |||||||||||||
1963 | 55.16 | 65.61 | 72.42 | 81.57 | 90.87 | 95.23 | 97.68 | 91.84 | 88.57 | 81.74 | 68.23 | 58.83 | a | 78.98 | ||||||||||||
1964 | 56.32 | 58.03 | 67.13 | 78.17 | 89.42 | 94.50 | 97.32 | 95.52 | 88.30 | 81.03 | 69.40 | 57.13 | 77.69 | |||||||||||||
1965 | 61.48 | 61.14 | 66.71 | 81.10 | 87.29 | 93.80 | 97.84 | 93.74 | 87.30 | 80.55 | 74.03 | 59.52 | 78.71 | |||||||||||||
1966 | 55.16 | 56.61 | 72.61 | 78.90 | 88.03 | 93.90 | 98.23 | 90.23 | 87.43 | 78.45 | 72.07 | 59.29 | 77.58 | |||||||||||||
1967 | 60.45 | 65.64 | 77.26 | 81.90 | a | 86.03 | 93.57 | 95.35 | 92.27 | a | 85.87 | 82.35 | 68.77 | 54.74 | 78.68 | |||||||||||
1968 | 56.03 | 64.55 | 66.77 | 77.34 | a | 89.45 | 98.93 | 94.55 | 91.97 | 89.17 | 84.74 | 67.04 | c | 57.78 | d | 78.19 | ||||||||||
1969 | 64.00 | 64.96 | 66.67 | a | 83.62 | a | 90.60 | a | 97.50 | 99.04 | d | 99.35 | 90.63 | 79.69 | b | 63.96 | b | 60.83 | a | 80.07 | ||||||
1970 | 59.43 | a | 63.93 | 67.00 | 78.77 | 88.50 | a | 95.36 | b | 97.65 | 95.45 | 88.93 | a | 73.82 | c | 69.33 | c | 65.00 | b | 78.60 | ||||||
1971 | 62.00 | a | 65.48 | a | 73.96 | c | 79.10 | 86.58 | 96.90 | 98.57 | a | 92.47 | a | 90.93 | a | 76.59 | d | 69.04 | b | ----- | z | 81.06 | a | |||
1972 | 61.13 | a | 66.75 | a | 80.04 | e | 83.08 | e | 87.70 | d | 93.79 | b | 97.76 | b | 92.25 | c | 87.00 | d | 81.30 | d | 65.39 | g | 61.00 | 81.07 | a | |
1973 | 54.81 | d | 57.96 | c | 67.74 | 74.29 | b | 86.68 | 96.21 | a | 95.77 | 95.39 | 93.67 | 84.63 | d | 73.79 | f | 62.42 | e | 79.05 | a | |||||
1974 | 60.21 | c | 64.88 | d | 76.71 | c | 83.07 | a | 91.93 | a | 99.97 | 96.10 | 91.81 | 83.57 | 79.19 | 66.63 | 57.72 | b | 79.32 | |||||||
1975 | 57.53 | a | 62.07 | 72.16 | 77.23 | 87.29 | 97.77 | 93.32 | 95.55 | 87.10 | 81.86 | c | 71.76 | e | 59.96 | c | 78.63 | |||||||||
1976 | 58.45 | 69.14 | a | 72.87 | 80.03 | 84.61 | 96.60 | 93.06 | 95.81 | 85.53 | 72.60 | k | 65.00 | j | 55.90 | a | 79.20 | b | ||||||||
1977 | 57.15 | d | 65.56 | a | 67.74 | 79.54 | b | 87.84 | 98.80 | 97.60 | a | 99.55 | 94.07 | c | 79.39 | 71.27 | 64.13 | 80.22 | ||||||||
1978 | 58.97 | 61.64 | 73.77 | 82.70 | 88.35 | 101.40 | 100.71 | 93.81 | 83.37 | 79.83 | a | 67.24 | a | 56.97 | 79.06 | |||||||||||
1979 | 52.90 | 62.43 | 70.77 | 80.07 | 86.19 | 94.77 | 100.19 | 92.90 | 91.62 | a | 87.35 | e | 69.64 | b | 63.00 | 79.32 | ||||||||||
1980 | 64.23 | 65.69 | 71.71 | 79.43 | 87.87 | 105.23 | 103.19 | 96.03 | 88.33 | 78.06 | 68.23 | 68.00 | 81.33 | |||||||||||||
1981 | 61.13 | 70.46 | 72.61 | 84.50 | 90.68 | 102.27 | 101.94 | 94.97 | 91.77 | 83.32 | 79.93 | 70.79 | c | 83.70 | ||||||||||||
1982 | 67.90 | 71.25 | 78.77 | 85.60 | 90.06 | 102.57 | 102.87 | 101.71 | 95.13 | 83.93 | a | 71.17 | 56.94 | 83.99 | ||||||||||||
1983 | 58.42 | 64.14 | 69.10 | a | 72.07 | a | 89.03 | 97.89 | b | 102.71 | 99.06 | 95.43 | 80.94 | 71.07 | 64.81 | d | 80.39 | |||||||||
1984 | 60.03 | b | 66.96 | a | 76.32 | 84.30 | 95.23 | 96.63 | 99.58 | 92.55 | 89.10 | 75.54 | c | 65.87 | 58.26 | 80.03 | ||||||||||
1985 | 53.58 | 64.41 | a | 71.29 | 82.43 | 90.48 | 97.93 | 99.06 | 97.29 | 87.97 | 77.13 | 71.92 | e | 62.87 | 79.70 | |||||||||||
1986 | 65.52 | 68.79 | 75.29 | 84.63 | 89.23 | 94.17 | 94.77 | 95.26 | 90.63 | 78.58 | 63.27 | 55.68 | l | 81.83 | a | |||||||||||
1987 | 59.04 | c | 63.41 | a | 68.48 | b | 78.03 | 87.13 | 96.23 | 98.71 | 94.58 | 88.43 | 85.58 | 69.17 | 60.41 | n | 80.80 | a | ||||||||
1988 | 59.45 | b | 65.89 | a | 72.94 | 80.90 | a | 89.73 | e | 97.48 | a | 96.13 | 92.20 | a | 90.10 | 85.71 | 71.20 | 61.12 | w | 81.98 | a | |||||
1989 | 61.17 | g | 68.44 | a | 79.89 | c | 88.45 | a | 93.39 | 101.37 | 98.84 | 94.32 | 90.45 | a | 82.52 | 71.17 | 60.21 | q | 86.88 | b | ||||||
1990 | 64.43 | h | 66.95 | i | 73.47 | a | 83.17 | 89.52 | 104.50 | 94.94 | 91.10 | 87.63 | 81.48 | f | 68.95 | j | 62.07 | q | 89.19 | e | ||||||
1991 | 58.18 | t | 66.55 | h | 70.67 | a | 81.67 | 91.94 | 98.13 | 93.87 | 93.97 | 84.80 | 82.81 | 66.27 | 58.65 | 82.28 | b | |||||||||
1992 | 54.94 | 64.03 | 72.16 | 84.37 | 85.71 | 98.27 | 99.68 | 95.65 | 93.03 | 83.32 | 63.43 | 54.58 | 79.10 | |||||||||||||
1993 | 59.73 | a | 64.44 | a | 74.21 | b | 83.64 | b | 91.30 | a | 99.21 | a | 97.81 | 96.42 | 90.69 | a | 79.26 | 68.20 | 59.29 | 80.35 | ||||||
1994 | 61.26 | 65.64 | 72.65 | 83.13 | 91.19 | 103.63 | 101.71 | 100.35 | 92.97 | 81.03 | b | 67.97 | 60.55 | 81.84 | ||||||||||||
1995 | 60.48 | 70.32 | 74.10 | 79.57 | 88.77 | 98.07 | 100.26 | 98.61 | 89.50 | 85.00 | 71.73 | 71.36 | q | 83.31 | a | |||||||||||
1996 | 64.45 | 71.00 | 72.65 | 82.57 | 96.29 | 101.17 | 100.19 | 94.84 | 89.70 | 82.90 | 71.40 | ----- | z | 84.29 | a | |||||||||||
1997 | 57.81 | e | 64.32 | 76.35 | 77.97 | 91.52 | 97.90 | 100.06 | 97.55 | 94.50 | 83.13 | a | 68.03 | 69.83 | y | 82.65 | a | |||||||||
1998 | 63.75 | c | 61.57 | 71.26 | 79.10 | 91.58 | 100.69 | a | 100.35 | 96.94 | 95.17 | 80.47 | a | 74.00 | 62.60 | u | 83.17 | a | ||||||||
1999 | 67.39 | c | 72.82 | 76.97 | 82.07 | 92.14 | b | 97.23 | 97.39 | 98.68 | 93.03 | 84.84 | 78.77 | d | ----- | z | 85.58 | a | ||||||||
2000 | 68.52 | f | 75.88 | l | 76.13 | 88.14 | b | 96.97 | 97.40 | 101.81 | 98.41 | b | 97.10 | 79.17 | b | 64.33 | l | ----- | z | 91.89 | d | |||||
2001 | 59.80 | a | 68.69 | b | 74.58 | 84.19 | c | 94.74 | 100.93 | 101.10 | a | 98.00 | 93.22 | c | 85.42 | 70.17 | f | 61.58 | s | 86.07 | b | |||||
2002 | 66.94 | n | 62.37 | i | 74.54 | c | 88.29 | b | 93.21 | b | 103.00 | d | 98.33 | a | 101.40 | a | 94.07 | b | 79.64 | f | 72.56 | n | 62.93 | q | 93.26 | e |
2003 | 69.05 | k | 66.33 | j | 74.14 | i | 82.52 | e | 93.96 | e | 99.55 | a | 101.93 | c | 100.04 | c | 94.15 | c | 88.09 | i | 75.72 | l | 66.88 | w | 95.36 | f |
2004 | 61.76 | j | 63.12 | l | 79.08 | g | 80.32 | h | 93.59 | b | 99.50 | 99.71 | 95.81 | 89.07 | b | 81.13 | 63.97 | 59.46 | r | 88.97 | e | |||||
2005 | 65.32 | l | ----- | z | 69.27 | i | 84.00 | g | 93.00 | f | 101.96 | e | 102.54 | e | 96.60 | a | 95.88 | d | 82.52 | f | 76.79 | k | 60.10 | u | 99.25 | h |
2006 | ----- | z | 63.50 | r | 74.00 | k | 87.00 | d | 93.74 | d | 100.66 | a | ----- | z | 91.90 | 86.79 | a | 82.59 | d | 73.16 | k | 62.43 | q | 90.45 | f | |
2007 | 58.12 | n | 62.47 | i | 77.74 | d | 81.80 | 89.07 | a | 100.03 | 98.77 | 98.94 | 93.00 | 86.22 | d | 75.73 | h | 66.44 | o | 90.70 | d | |||||
2008 | 61.15 | k | 71.75 | i | 76.19 | 84.47 | 92.18 | c | 102.73 | 94.76 | b | 94.55 | 87.57 | 83.93 | d | 74.88 | n | 69.83 | s | 89.55 | d | |||||
2009 | 66.00 | l | 71.74 | i | 77.10 | 82.00 | a | 93.80 | a | 97.57 | 102.75 | c | 100.22 | h | 91.17 | f | ----- | z | ----- | z | ----- | z | 90.64 | g | ||
Period of Record Statistics | ||||||||||||||||||||||||||
MEAN | 59.30 | 64.98 | 72.19 | 80.97 | 89.53 | 97.75 | 97.59 | 95.09 | 89.91 | 80.95 | 68.58 | 60.14 | 79.24 | |||||||||||||
S.D. | 4.15 | 3.49 | 3.72 | 3.38 | 2.82 | 3.02 | 2.90 | 2.72 | 3.18 | 3.25 | 3.88 | 3.66 | 1.62 | |||||||||||||
SKEW | -0.09 | 0.07 | -0.20 | -0.03 | 0.50 | 0.26 | 0.10 | 0.38 | 0.11 | -0.14 | 0.36 | 0.35 | 0.88 | |||||||||||||
MAX | 67.90 | 72.82 | 80.04 | 88.45 | 96.97 | 105.23 | 103.19 | 101.71 | 97.10 | 87.55 | 79.93 | 70.79 | 83.99 | |||||||||||||
MIN | 47.20 | 56.61 | 62.45 | 72.07 | 84.16 | 91.23 | 92.29 | 89.58 | 83.37 | 73.82 | 59.60 | 52.16 | 75.83 | |||||||||||||
YRS | 57 | 60 | 67 | 69 | 70 | 71 | 70 | 70 | 70 | 63 | 58 | 49 | 42 |